By the time we reach adulthood, most of us are familiar with the concept of deja vu. Translated directly from the French, deja vu literally means "already seen." The term describes the sensation of having experienced a certain situation before. However, fewer people are familiar with the concept of deja reve. Similar but distinct from deja vu, deja reve occurs when you experience something in real life that you have previously experienced in a dream.
Deja reve is one of those brain-related phenomena that scientists are yet to fully understand. And while it can be unsettling, it is not usually considered a cause for concern.
Intrigued? Check out this gallery to find out more about deja reve.